Multiple-cylinder two-cycle explosion-engine.



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ALEXANDER WINTON'AND HAROLD B. ANDERSON, or cLEvELAxD, omo, ASSIGNORS To THE l i wix'rox noToR CARRIAGE COMPANY, or CLEVELAND, omo.

MULTIPLE-CYLINDER TWO-CYCLE EXPLOSION-ENGINE.

Specification of Letters Patent.

Application led Apr1 13 1908. Serial No. 426,875.

and HAROLD B. ANDERSON, citizens of the` United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful lm rovements in Multiple-Cylinder Two-Cyc e. Explosion-Engines, of which the following is a g specification, reference being had therein to 10 i3 e accompanying drawing.

This inventlon relates to improvements in multiple c linder two-cycle explosion engines, whic utilize one carburetor for more than one cylinder, and the object of the present invention is to provide a means for controllinfr the richness of the explosive mixture individual cylinder independent of the carbureter.

As is Well known to those skilled in this art, two-cycle engines draw the explosive mixture into the crank-case, compress it there, and transfer the compressed charge from the crank-case to the explosion cylinder. In multiple cylinder two-cycle en mes there is a variation of compression in t eindividual crank-cases of the cylinders, on account of the variation in volume, and because of leakageswhich might be greater in one crankcase 'than in another. The leakage of the crank-cases will also vary from use, on account of the uneven wear in the crank-case bearings, and as a consequence uneven volumes are drawn to the individual crankcases, which results in ununiform explosive mixtures for the individual cylinders. One or'more cylinders will be found to get too rich amixture, while the others are getting a. proper mixture, or vice versa, and this cannot be cured by carbureter adjustment, because if the fluid supply is cut down to suit the overrich mixture, the mixture to the othercylinderswill be too lean; or if the mixture to one or more cylinders is too lean, it cannot be cured by the carbureter adjustment Without making the mixture to the other cylinder or cylinders too rich.

s improvement enables the explosive mixtures for the cylinders to be individually adjusted independently of the carbureter,l

and in that way the explosive mixture to the several cylinders is kept uniform, and of the pro er richness to obtain the best results.

l ie 'invention is illustrated in the accompanying drawings, in which Figure 1, is atop plan view of a multiple cylinder two-cycle engine embodying the Invention. Fig. 2, 1s a vertical, sectional \.m Patented Aug. 4, 1908.

view through one of the cvlinders, showing the improvement ap lied thereto.

For the purpose o illustrating the present improvement, a three-cylinder two-cycle engine is herein shown, though itis to be understood that the invention is applicable to any number of cylinders more than one, and to any form of two-port or three-port twocycle engine.'

Referring now to the drawings, 1 are the cylinders, 2 the carbureter, and 3 the manifold piping connecting the carbureter with thecrank-cases of the severalc linders. This manifold piping is so divided t at there is the same lengt-h of travel for the gas between the carbureter and each crank-case. A throttle 4 is 4located between the carbureter land the 'manifold piping as is usual in such constructions.

The present improvement consists in providing each cylinder of the, branches of the manifold piping with an atmospheric communication, here shown in the form of an L- shaped passage a, which is preferably placed close to the cylinder. This passage 1s controlled by an adjustable valve b, for regulating the amount of air that is admittedthrough the orifice a to the pipe.

The o eration is, that when one or more of the cy inders are receiving a richer mixture than the others, because of wear ofthe crankcase bearings, or for any other cause, it is possible to brine the mixtures of the several cylinders uniform by admitting the proper amount of air through the orifice a to reduce the proportion of the richer mixture.

Suppose one cylinder is getting too rich a. charge, which invariably happens for the reasons herein stated. lf in this instance the carbureter isrecfulatcd to reduce the gasolene feed to feed t e proper mixture to this cylinder, the mixture to the other cylinders will be correspondingly cut down, and the mixture for them will be too lean, and, of course, a decid'cd lossof power: and furthermore, the lean charge is difficult to control at low speeds, as back-firing is likely to take place through the carbureter because the weak charge burns very slowly, setting fire to the gas in the crank-case, instead of beingV Wholly burned by the time the exhaust port is opened, and before the gas inlet port is opened, as it should be.

supply tpipe for each individual cylinder, We

are ena led to make allowance for any variation in the mixture fed to the individual cylinders independentl of the carbureter, and iii this way cause t e proper mixture to be fed to each cylinder, and thereby obtain the most efficient result.

is claimed, and desired to be secured by Letters Patent, is

1. The combination with a multiple cylinder two-cycle explosionv engine, of e. single carbureter having a supply communication 15 for each cylindei, and meanefoi` admittin air to said communications independent o the carbureter.

2. The combination with a inuiti le cylinder two-cycle exploeion engine, o a single .S3 i A895,232

cerbureter, a cei'huieter supply pipe foreach cylinder, each of said pipes andmeans for controlling said orifices.

3. The'combinetion With :1 multi le cylinder two-cycle explosion engine, o a single carbureter having aVv supply communicationl for each cylinder, and means for admitting Having thus described this invention,-what.

regulated volumes of air to one of said communications independently 4of both the carbuietei and the other communication.

In testimony whereof We alixcour signa.- tures-in presence of two witnesses.

ALEXANDER WiNToN. HAROLD B. ANDERSON.

Y Witnesses:

N. J. WARD, e A

W. A. Rimini. /f

having an ai1' V inlet orice independent of the carbureter, 

